Removable calk for horseshoes.



No. 822,541. PATENTED JUNE 5, 1906.

M. DB W. & H. H. MUDGE. REMOVABLE GALK FOR HORSESHOES.

APPLICATION FILED JAN. 6. 1906.

Jryzmn7e dew Wa ye #6/2/1 1 Q9 UNITED STATES PATENT OFFICE.

MARGUERITE DE W. MUDGE AND HENRY H. MUDGE, OF BRISTOL, RHODE ISLAND.

REMOVABLE CALK FOR HORSESHOES.

Specification of Letters Patent.

Patented June 5, 1906.

Application filed January 6, 1906. Serial No. 294,896.

-To all whom it may concern:

' provement in removable calks, the purpose not the calkbase.

being to provide a simple and secure screwfastening for the calk and rendering its removal easy, and in the claims appended hereto we will point out the precise improvement in connection with the accompanying drawin s, in which Figure 1 shows in plan view the under side of the shoe and the toe and heel calks thereof embodying our invention. Fig. 2 is a vertical section of the toe-calk as applied to the shoe. Fig. 3 shows the calk in perspective. Fig. 4 shows the recess at the toe of the shoe. Fig. 5 is a crosssection of the shoe on the line 1 1 of Fig. 1. Fig. 6 shows in vertical section the toecalk having its inner side parallel with the face of the shoe and the fasteningscrew threaded only to engage the shoe and Fig. 7 shows a plate which forms a filler-base for the recess when the calk is removed. Fig. 8 shows in plan the filler-base secured in place of the calk. Fig. 9 is a vertical section of the same. Fig. 10 shows a modification in the position of the toe-recess. Fig. 11 is an end view of the screw having an annular central opening. Fig. 12 shows the conical headless screw. Fig. 13 shows the toe-calk fitted in a recess having parallel undercut walls.

Dovetail recesses 1 are formed in the under side of the, shoe at its toe and at its heel ends and preferably of wedge shape flatwise and having its walls 2 2 undercut with the wedge or taper form extending inward from the outer edge of the shoe and the bottom of the recess preferably inclining upward from the inner edge to the outer edge of the shoe, and into these undercut recesses the calks are fastened. The calk 3 is formed with a baseplate 1, having beveled edges 5,, while its under side preferably inclines upward from its narrowest to its widest end and is therefore the counterpart of the recess and is adapted to fit therein, so that when the calk is driven into the recess it will have a binding function within and upon the dovetail walls, causing the calk-base to press upward on the fiat surface of the recess and lessen the pressure on the dovetail walls, whereby the calk has a firm and secure seating A screw-threaded opening 6 is cut in the bottom of the recess, and the calk-base has a corresponding opening 7, which may or may not be screw-threaded, so that the openings will register when the calk is driven into the recess. Into these openings a screw 8, preferably without head, is drlven and formed with an opening 9, preferably of square cross-section, but may be angular, passing through its central length, and which forms a socket to receive the square end 10 of a driver, which for convenience may be L-shaped to allow it to be rotated over the calk. WVhen driven home, the ends of the screw are flush with the surface of the calk-base and with the inner surface of the shoe, and the hollow construction of the screw gives the advantage of leverage and quickness in screwing and unscrewing it, and in the event of its breaking in the shoe the broken part can be easily removed. It also ives the advantage of having no end wear from driving and removing the screw.

The roughened base-plate 11 (shown in Figs. 7, 8, and 9) is used as an interchangeab e filler with the calks when the latter are not desired on the shoe, the filler having the identical form of the calk-base and is intend ed to fill the recess and hasan opening 12, registering with the opening in the shoe, and is secured by the screw which is used for securing the calk. Obviously the bottom of the recess may be made parallel with the face of the shoe, as in Fig. 6, instead of inclined; but the latter construction is preferable as giving a more firm seating to the calk, and the undercut walls may be parallel, as in either case the screw is the securing means.

The heel-calks and the recesses are of identical construction and secured in the same way as the toe-calk. While we have shown and prefer to provide both the calk-basc and the shoe with screw-threads, obviously the screw may only engage the shoe, thereby rendering it quicker to drive and to remove the screw and more easy to adjust the calk-base, having a smooth hole, as in Fig. 6.

While the screw is effective for securin the calk-base in its seat against endwise or horizontal thrust by passing through an opening in the base of the calk and screw-threaded in the shoe, we utilize the screw as an adjuvant means for. binding or clamping the edges of the calk-base laterally against and between the undercut walls of the recess under the action of the screw in driving it into the shoe through the non-threaded opening into the calk-base. For this purpose we make the non-threaded part or the screw conical, as in Fig. 12, and provide the base of the calk with a slit 13, Fig. 3, so as to split the opening, preferably, parallel with the edges of the calkase, so that in driving the screw through the opening in the calk-base its split parts will be caused to open at the slit and spread sidewise, forcing thereby the beveled edges of the split parts against the undercut walls of the recess, so that the calk is clamped or bound in its seat. To cause this spreading or expanding of the split calk parts, the unthreaded end 14 .of the screw is made conical, as in Figs. 6 and 12, so that as it is driven it acts as a Wedge in forcing the split parts open and presses them against the undercut walls of the recess. This lateral binding action of the calk against the undercut walls of its seat serves to relieve the screw of the effects of the thrusts of the calk, and looking at Fig. 6 it will be seen that the non-threaded conical part of the screw and the walls of opening in the base of the calk are of corresponding form.

We claim 1. A horseshoe having on its under side a recess the walls of which are undercut, the

3 bottom of said recess inclining upward from the inner to the outer edge of the shoe and having a screw-threaded opening, in combination with a calk having a base-plate adapted to fit said recess and provided with an opening registering with the opening in the shoe, and a screw passing through said openings and having a central angular opening.

2. A horseshoe having on its under side a recess, its side walls undercut, and having a screw-threaded opening in its bottom, in combination with a calk having a base-plate adapted to fit said recess and provided with a non-threaded opening registering with the screw-opening in the shoe, and a headless screw having an angular central opening, and passing through both said openings in engagement with the shoe-opening and having its ends flush with the face of the calk baseplate and with the inner face of the shoe.

3. A horseshoe having on its under side a recess, its side walls undercut, and having a screwthreaded opening in its bottom in combination with a calk having a base-plate tapering from the outer, to the inner edge of the shoe and formed with an opening registering with the opening in the shoe, and a headless screw having a central angular opening from end to end, and passing through both said openings in engagement with the shoe and having its ends flush with the face of the calk base-plate and with the inner face of the shoe.

4. A horseshoe having a recess on its under side formed with undercut walls and having a screw-threaded opening in the bottom of said recess, in combination with a calk having a base-plate adapted to fit said recess and provided with a non-threaded opening and a slit splitting said opening, and a screw pass ing through both said openings in engagement with the shoe-opening and having a non-threaded part of conical form for engaging and laterally expanding by the driving of the screw the split parts of the calk-base whereby it is caused to be bound or clamped against and between the undercut walls of said recess.

5. A horseshoe having a recess on its under side formed with undercut walls and having a screw-threaded opening in the bottom of said recess, in combination with a calk having a base-plate adapted to fit said recess and provided with an opening and a slit splitting said opening, and a screw passing through both said openings in enga ement with the shoe-opening, and means wilereby the split base parts of the calk may be expanded to bind or clamp them against and between the undercut walls of said recess.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

MARGUERITE DE W. MUDGE. HENRY H. MUDGE.

Witnesses:

FLORENCE A. TARvEs, G. H. STRAIGHT. 

